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Contractor license records in Ontario, CA
918 records with Ontario as their locality of record in CSLB's records, as of November 3, 2026. Statuses print as the board records them; a record listed as suspended is not a current credential.
Source: California Contractors State License Board (CSLB) — records as of November 3, 2026. Records change; the board’s own CSLB License Check is the current source.
By classification in Ontario
General Building (338) · Electrical (137) · General Engineering (61) · Warm-Air Heating, Ventilating and Air-Conditioning (51) · Painting and Decorating (50) · Plumbing (49) · Low Voltage Systems (36) · Landscaping (34) · Concrete (32) · Flooring and Floor Covering (32) · Roofing (26) · Cabinet, Millwork and Finish Carpentry (22) · Doors, Gates and Activating Devices (22) · Glazing (21) · Drywall (20) · Ceramic and Mosaic Tile (18) · Synthetic Products (17) · Swimming Pool (16) · Masonry (16) · Structural Steel (13) · Fire Protection (12) · Refrigeration (12) · Building Moving/Demolition (12) · Pool and Spa Maintenance (11) · Window Coverings (9) · Sanitation System (9) · Prefabricated Equipment (9) · Lathing and Plastering (9) · Earthwork and Paving (8) · Metal Products (8) · Parking and Highway Improvement (7) · Sign (7) · Reinforcing Steel (7) · Machinery and Pumps (7) · Concrete-Related Services (7) · Hazardous Substance Removal Certification (6) · Ornamental Metal (6) · Fencing (5) · Service Station Equipment and Maintenance (5) · Sheet Metal (5) · Welding (5) · Framing and Rough Carpentry (4) · Construction Cleanup (4) · Tree Service (4) · Residential Remodeling (4) · Non-Electrical Sign Installation (3) · Solar (3) · Non-specialized (3) · Asbestos Certification (3) · Asbestos Abatement (3) · Tree and Palm (3) · Paperhanging (2) · Awnings (2) · Construction Zone Traffic Control (2) · Boiler, Hot-Water Heating and Steam Fitting (2) · Pipeline (2) · Insulation and Acoustical (2) · General Manufactured Housing (1) · Suspended Ceilings (1) · Well Drilling (1) · Lock and Security Equipment (1) · Hardware, Locks and Safes (1) · Safes and Vaults (1) · Siding and Decking (1) · Scaffolding (1)
- NEW LOOK MANDOS PAINTING INC CLEAR
- NEW VIEW AUTO GLASS INC CLEAR
- NEXERA CONCRETE CLEAR
- NEXT GENERATION FLOOR COVERING CLEAR
- NEXT LEVEL CONTRACTORS INC CLEAR
- NG CONCRETE Work Comp Susp
- NICHOLS ELECTRIC CLEAR
- NICK AIR CONDITIONING INC CLEAR
- NICK LEO FIGUEROA Work Comp Susp
- NO LIMIT TILE & STONE LLC CLEAR
- NON STOP FLOORING & DESIGN CLEAR
- NORTH AMERICAN CRANE COMPANY CLEAR
- NORTON GENERAL CONTRACTORS CLEAR
- NSD ELECTRIC Contr Bond Susp
- O&A CUSTOM WINDOW FASHIONS INC CLEAR
- OG PLASTERING INC CLEAR
- OLD SCHOOL MASONRY INC CLEAR
- OMEGA DOORS CORP CLEAR
- ONTARIO ELECTRIC INC CLEAR
- ONTARIO REFRIGERATION COMMERCIAL AIR CONDITIONING HEATING & CONTR CLEAR
- ONTARIO WHOLESALE CARPET CLEAR
- ONTARIOS LANDSCAPE INC CLEAR
- OPTI - COMM TECHNOLOGIES CLEAR
- ORANGE COAST NETWORK SOLUTIONS CORP CLEAR
- ORANGE INDEPENDENT PLUMBING SERVICES CLEAR
- ORANGE WEST PLASTERING CLEAR
- ORELLANA'S GARAGE DOORS INC CLEAR
- ORTIZ DEMOLITION INCORPORATED CLEAR
- P & P PAVERS INC CLEAR
- P V & C PLUMBING AND PIPING INC CLEAR
- PAC BUILDERS CORP CLEAR
- PACIFIC APPLICATIONS CORP CLEAR
- PACIFIC EDGE CONCRETE CLEAR
- PACIFIC REBAR INC CLEAR
- PACKS CONSTRUCTION CLEAR
- PAGO ROOFING CLEAR
- PAM PAN XU CLEAR
- PARADISE POOL SUPPLIES & REPAIRS CLEAR
- PARKCREST CONSTRUCTION INC CLEAR
- PARKING AND HIGHWAY IMPROVEMENT CLEAR
- PASCAL & LUDWIG CONSTRUCTORS INC CLEAR
- PAUL B HOFER III CLEAR
- PBS CONSTRUCTION SERVICE LLC CLEAR
- PENGHAO YUAN CONSTRUCTION CLEAR
- PENNCO CONSTRUCTION GROUP INC CLEAR
- PERCEPTION PAINTING CO CLEAR
- PERERA CONSTRUCTION & DESIGN INC CLEAR
- PERFECT CONSTRUCTION CO CLEAR
- PHIL'S CONSTRUCTION CLEAR
- PHILLIP PARK CLEAR
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